FA-2312 High-Flow Washable Air Filter – Replaces OEM 2312-Style Air Filters
High-flow, washable air filter FA-2312
After decades working on heavy-duty diesel engines, I’ve learned that intake restriction almost never shows up as a sudden failure. It shows up as higher EGTs, lazy throttle response, excess soot, and DPF systems that regen more than they should. OEM 2312 paper filters do their job when they’re new, but once they load with dirt, restriction climbs fast.
That’s why I designed the FA-2312.
This is a high-flow, washable air filter, engineered to maintain airflow over time instead of choking the intake as miles stack up. The synthetic filter media resists collapse and airflow drop-off under sustained load, keeping the turbo operating in its efficiency range and combustion stable.
Sealing matters just as much as airflow. The FA-2312 uses OEM-matched sealing geometry so air goes through the filter — not around it. No bypass means better protection for the turbo, charge-air cooler, and engine internals.
Instead of throwing away paper filters every service interval, you wash the FA-2312, oil it correctly, reinstall it, and keep running. One filter replaces years of disposable elements, reduces downtime, and lowers long-term operating cost without sacrificing engine protection.
Compatibility Note:
If your truck or equipment calls for an OEM 2312-style air filter, the FA-2312 is a direct drop-in replacement with no modifications required.
Replaces OEM & Aftermarket Filters (Table Format)
| Brand / Category | Filter Part Number or Type Replaced |
|---|---|
| OEM | 2312 Air Filters |
| OEM / Aftermarket | 2312-Style Paper Filters |
| Aftermarket | Equivalent 2312-Series Intake Filters |
| Fleet / Fleetguard | 2312 Equivalent Filters |
| Baldwin | 2312 Equivalent Filters |
| Donaldson | 2312 Equivalent Filters |
| Wix / NAPA | 2312 Equivalent Filters |
Note: Replacement compatibility is based on factory 2312 dimensions and sealing geometry. Exact brand part numbers may vary by catalog.
5. OEM Cross-Reference Table
| OEM / Factory Part # | Application Type | Replaced By |
|---|---|---|
| 2312 | Heavy-Duty Diesel Intake | FA-2312 |
| 2312-Style Paper Filter | Class 6–8 Diesel | FA-2312 |
Features & Benefits
Features
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High-flow washable synthetic filter media
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OEM-matched sealing flange
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Designed for turbocharged diesel airflow
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Reusable, serviceable construction
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Drop-in replacement for 2312-style filters
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Built for high-mileage and fleet use
Benefits
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Maintains consistent airflow under load
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Reduces intake restriction over time
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Helps reduce forced DPF regens
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Lower exhaust gas temperatures
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Improved throttle response
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Less downtime from filter replacements
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Long-term savings vs disposable paper filters
Competitor Differentiation
Disposable paper filters are designed to be replaced, not to maintain airflow. As they load with dirt, restriction climbs and performance drops.
I built the FA-2312 to hold airflow steady over time, not just look good when it’s clean. Washable media keeps restriction lower, sealing surfaces actually seal, and the filter doesn’t become trash after one dirty service cycle.
Disposable filters keep you buying. A properly engineered washable filter keeps your engine breathing right and your operating costs under control.
Made in the USA!
A set of two Fleet Air Filters
*Price does not include Klotz Oil*
Fits:
Kenworth: T600, T800, W900
Mack
Peterbilt: 357, 375, 377, 378, 389
If your filter number or truck is not listed please call us at 251.654.0892!
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Instructions - Warranty, Cleaning, and Installation
